This is the Habitat in Hawaii Helping Astronauts Preparing to Explore Mars

When it comes time to send astronauts to Mars, those who make the journey will need to be ready for a number of challenges. In addition to enduring about six-months in space both ways, the first astronauts to explore Mars will also need to be prepared to spend months living on the surface. This will consist of long periods spent in a pressurized habitat and regular forays to the surface wearing pressure suits.